To feed its young, an owl captures mice that eat grains. The owl also eats small snakes that feed on these mice. The diet of owls represents the roles of
A) a first order and second order consumer.
B) a second and third order consumer.
C) an herbivore and a carnivore.
D) a producer and a consumer.
Question 2
Buses and cars using fuel cells are
A) not yet possible because the technology to safely store hydrogen is still not resolved.
B) not yet available because the fuel cell generates unsafe levels of heat.
C) still inefficient, mostly because the fuel cells are large and heavy.
D) already in use and ready for commercial production.
The small-scale distribution of different tree species in a Douglas-fir forest is determined by both
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Three-dimensional models of the small and large subunits of ribosomes.
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